contacts merging issue - NOTE8

My contact are automatically getting mixed example: George number is 1234 while Alex is 9876 then suddenly I see that George is 1234 & 9876 so the contacts app system always tells me that I have many contacts to merge. Another example is that it is mixing names example George Stampford and Alex Bigg creates George Alex Stampford. Very annoying. Sometimes I call someone thinking he is George but find out that I called Alex. And lastly. The phone is deleting contacts. I went to the place I bought this note 8 but they said they don't know this issue first time to hear. I assume it's a bug? Pls help..